[PATCH] D94891: [Coroutine] Remain alignment information when merging frame variables

[Chuanqi Xu via Phabricator via llvm-commits]

ChuanqiXu created this revision.
ChuanqiXu added reviewers: jmorse, lxfind, junparser.
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This is to address bug48712 <https://bugs.llvm.org/show_bug.cgi?id=48712>.
The solution in this patch is that when we want to merge two variable `a` into the storage frame of variable `b` only if the alignment of `a` is multiple of `b`. 
There may be other strategies. But now I think they are hard to handle and benefit little. Or we can implement them in the future.

Test-plan: check-llvm


https://reviews.llvm.org/D94891

Files:
  llvm/lib/Transforms/Coroutines/CoroFrame.cpp
  llvm/test/Transforms/Coroutines/coro-frame-reuse-alloca-04.ll
  llvm/test/Transforms/Coroutines/coro-frame-reuse-alloca-05.ll

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